﻿using System;
using Artemis.Storage.Entities.Profile;

namespace Artemis.Core;

/// <summary>
///     Represents a keyframe on a <see cref="LayerProperty{T}" /> containing a value and a timestamp
/// </summary>
public class LayerPropertyKeyframe<T> : CorePropertyChanged, ILayerPropertyKeyframe
{
    private LayerProperty<T> _layerProperty;
    private TimeSpan _position;
    private T _value;

    /// <summary>
    ///     Creates a new instance of the <see cref="LayerPropertyKeyframe{T}" /> class
    /// </summary>
    /// <param name="value">The value of the keyframe</param>
    /// <param name="position">The position of this keyframe in the timeline</param>
    /// <param name="easingFunction">The easing function applied on the value of the keyframe</param>
    /// <param name="layerProperty">The layer property this keyframe is applied to</param>
    public LayerPropertyKeyframe(T value, TimeSpan position, Easings.Functions easingFunction, LayerProperty<T> layerProperty)
    {
        _position = position;
        _layerProperty = layerProperty;
        _value = value;

        EasingFunction = easingFunction;
    }

    /// <summary>
    ///     The layer property this keyframe is applied to
    /// </summary>
    public LayerProperty<T> LayerProperty
    {
        get => _layerProperty;
        internal set => SetAndNotify(ref _layerProperty, value);
    }

    /// <summary>
    ///     The value of this keyframe
    /// </summary>
    public T Value
    {
        get => _value;
        set => SetAndNotify(ref _value, value);
    }

    /// <inheritdoc />
    public ILayerProperty UntypedLayerProperty => LayerProperty;

    /// <inheritdoc />
    public TimeSpan Position
    {
        get => _position;
        set
        {
            SetAndNotify(ref _position, value);
            LayerProperty.SortKeyframes();
            LayerProperty.ReapplyUpdate();
        }
    }

    /// <inheritdoc />
    public Easings.Functions EasingFunction { get; set; }

    /// <inheritdoc />
    public KeyframeEntity GetKeyframeEntity()
    {
        return new KeyframeEntity
        {
            Value = CoreJson.Serialize(Value),
            Position = Position,
            EasingFunction = (int) EasingFunction
        };
    }

    /// <inheritdoc />
    public void Remove()
    {
        LayerProperty.RemoveKeyframe(this);
    }

    /// <inheritdoc />
    public ILayerPropertyKeyframe CreateCopy()
    {
        return new LayerPropertyKeyframe<T>(Value, Position, EasingFunction, LayerProperty);
    }
}